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<title>Berkeley DB Reference Guide: Release 4.1: upgrade requirements</title>
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<td><b><dl><dt>Berkeley DB Reference Guide:<dd>Upgrading Berkeley DB Applications</dl></b></td>
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<p align=center><b>Release 4.1: upgrade requirements</b></p>
<p>The log file format changed in the Berkeley DB 4.1 release.</p>
<p>All of the access method database formats changed in the Berkeley DB 4.1
release (Btree/Recno: version 8 to version 9, Hash: version 7 to version
8, and Queue: version 3 to version 4).  <b>The format changes are
entirely backward-compatible, and no database upgrades are needed.</b>
Note that databases created using the 4.1 release may not be usable with
earlier Berkeley DB releases.</p>
<p>For further information on upgrading Berkeley DB installations, see
<a href="../../ref/upgrade/process.html">Upgrading Berkeley DB installations</a>.</p>
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